Has any research been done, or does anyone have first hand experience, regarding counter rotating props spinning inwards or outwards on model cats ?
Is one way better than the other for top speed , cornering , or stability?
Forget about full size offshore cats because the throttle man is working flat out constantly adjusting the throttles and trim to keep the boat stable.
I have this totally unproven theory that the props should spin inwards ( l/h prop clockwise and r/h prop antclockwise ) based on the following -
If the boat hits some rough water and say the l/h prop comes partly out of the water the r/h prop will push the bow to the left because the thrust is now off centre.
However if in this situation the r/h prop is spinning anticlockwise it will also try to propwalk the stern to the left which should partly offset the off centre thrust.
Is this theory correct, probable, possible, or a load of cobblers ?
Interested to hear from you twin cat guys.
Regards
Graham.
Is one way better than the other for top speed , cornering , or stability?
Forget about full size offshore cats because the throttle man is working flat out constantly adjusting the throttles and trim to keep the boat stable.
I have this totally unproven theory that the props should spin inwards ( l/h prop clockwise and r/h prop antclockwise ) based on the following -
If the boat hits some rough water and say the l/h prop comes partly out of the water the r/h prop will push the bow to the left because the thrust is now off centre.
However if in this situation the r/h prop is spinning anticlockwise it will also try to propwalk the stern to the left which should partly offset the off centre thrust.
Is this theory correct, probable, possible, or a load of cobblers ?
Interested to hear from you twin cat guys.
Regards
Graham.
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